RT Journal Article SR Electronic T1 Abstracts JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 249 OP 249 DO 10.48044/joa.1982.8.9.249 VO 8 IS 9 YR 1982 UL http://auf.isa-arbor.com/content/8/9/249.abstract